A species of cow that live on hills. the legs on one side are shorter, so they can never turn around or the'll roll down the hill.

Briefly, "the realization that each random passerby is living a life as vivid and complex as your own." Originally from the Dictionary of Obscure Sorrows, which has a lot more beautiful neologism definitions like this you might enjoy.

Very special cows the live on a hill whose front legs are shorter than your back legs so when they eat their food will digest properly